# app/services/schema_service.py

from typing import List
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select

from app.core.biz_exception import NotFoundError
from app.models.schema import VasSchema
from app.schemas.schema import VasSchemaCreate, VasSchemaUpdate


class SchemaService:

    @staticmethod
    async def create(
        db: AsyncSession,
        data: VasSchemaCreate,
    ) -> VasSchema:
        rec = VasSchema(**data.model_dump(by_alias=True)) 
        db.add(rec)
        await db.commit()
        await db.refresh(rec)
        return rec

    @staticmethod
    async def get(
        db: AsyncSession,
        id: int,
    ) -> VasSchema:
        stmt = select(VasSchema).where(VasSchema.id == id)
        obj = (await db.execute(stmt)).scalar_one_or_none()
        if not obj:
            raise NotFoundError("Schema not exist")
        return obj

    @staticmethod
    async def update(
        db: AsyncSession,
        id: int,
        data: VasSchemaUpdate,
    ) -> VasSchema:
        stmt = select(VasSchema).where(VasSchema.id == id)
        obj = (await db.execute(stmt)).scalar_one_or_none()
        if not obj:
            raise NotFoundError("Schema not exist")
        
        update_data = data.model_dump(exclude_unset=True, by_alias=True)
        for k, v in update_data.items():
            setattr(obj, k, v)

        await db.commit()
        await db.refresh(obj)
        return obj

    @staticmethod
    async def delete(
        db: AsyncSession,
        id: int,
    ) -> None:
        stmt = select(VasSchema).where(VasSchema.id == id)
        obj = (await db.execute(stmt)).scalar_one_or_none()
        if not obj:
            raise NotFoundError("Schema not exist")

        await db.delete(obj)
        await db.commit()

    @staticmethod
    async def list_all(
        db: AsyncSession,
    ) -> List[VasSchema]:
        stmt = select(VasSchema)
        result = await db.execute(stmt)
        return result.scalars().all()